Perylene Diimide Trimers Based Bulk Heterojunction Organic Solar Cells with Efficiency over 7%

Abstract

Fullerene‐free polymer solar cell devices based on a new acceptor, H‐tri‐PDI that is connected by three perylene diimide (PDI) units via imide position shows a power conversation efficiency of 7.25% with a short circuit current density of 16.5 mA cm−2. Thus H‐tri‐PDI molecules and the method of connecting multiple PDI units via imide position provide a reliable guide for the further development of PDI‐based acceptors.

Recent Advances in Nonfullerene Acceptors for Organic Solar Cells

“…From this work, a new design strategy was proposed that introducing a twisted structure could disrupt the crystal packing behavior of the photoactive materials without influencing the charge transfer properties. Later, another novel nonfullerene small molecule acceptor T4 was developed by Hou and co‐workers that the three PDI monomers were linked by the head‐to‐head NN covalent bond . Due to the solvent additives, the photoactive layer obtained increased packing structure and appropriate phase separation that could be beneficial for obtaining a better PCE value when blended with the donor PBDT‐TS1.…”

“…Later, another novel nonfullerene small molecule acceptor T4 was developed by Hou and coworkers that the three PDI monomers were linked by the headto-head NN covalent bond. [217] Due to the solvent additives, the photoactive layer obtained increased packing structure and appropriate phase separation that could be beneficial for obtaining a better PCE value when blended with the donor PBDT-TS1. Recently, Zhan group reported a novel nonfullerene small molecule acceptor T5 where the two PDI units were linked by a thiophene bridge in the bay positions of each mono PDI molecule.…”

Unraveling the efficiency-limiting morphological issues of the perylene diimide-based non-fullerene organic solar cells

“…Unfortunately, in polymer donor:monomeric-PDI acceptor based systems, large-scale phase separation induced by strong molecular aggregation among monomeric PDIs can seriously limit excimers 7 dissociation and charge transport 18,19 . The molecular aggregation among PDIs was recently ameliorated through the design of twisted and three-dimensional (3D) structured PDI molecules, but still, there are few factors that are limiting the PCEs of the PDI based OSCs as compared to fullerene-based OSCs 20–24 . Therefore, a thorough comparative analysis of the molecular structures of small molecule acceptors and their solid-state properties is necessary for further development of PDI-based acceptors.…”

Triperylene Hexaimides Based All‐Small‐Molecule Solar Cells with an Efficiency over 6% and Open Circuit Voltage of 1.04 V

“…[56] Thus, small molecules as an interesting and developing sub-branch in OSCs field are promising. [63][64][65][66][67] In addition, in recent years, the three-dimensional (3D) PDI small molecule acceptors have got great achievements with the advantages of high extinction coefficient, favorable BHJ morphology featuring a small domain size, and a higher open circuit voltage (V oc ). [47,[57][58][59][60] As one of the typical electronic acceptor, PDI derivatives have been paid great attention and have achieved fast advances during the past few years.…”